NCbob, thanks for the compliments. I am really trying to keep some of the original look of the bus. Yes I have the 9 and just happen to have the bus parked out front. The tail light assembly measures 19 inches top to bottom and 8.5 inches side to side. I can tell you the the housings from MCI are outrageous at about $400.00 per side (yes just the housing). I would try Sam Caylor at Caylor supply in Kansas to see if he has some used assemblies. In the end, if you are going to modify the assemblies to a point of complete change, and you are not really focused on original look, you may even want to watch ebay or other sites for semi truck parts, I have seen complete assemblies for pennies.
I hope to get the front LED lights completed this week.
Good luck!
Grant